Replace LoadNamedFieldPolymorphic with explicit branches.

test/mjsunit/load_poly_effect.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-function TestNonSmiArrayLength() {
-  function f(a) {
-    return a.length+1;
-  }
+var o = {};
+var count = 0;
+Object.defineProperty(o, "x", {get:function(){count++;return 100}});
 
-  var a = [];
-  a.length = 0xFFFF;
-  assertSame(0x10000, f(a));
-  assertSame(0x10000, f(a));
-
-  %OptimizeFunctionOnNextCall(f);
-  a.length = 0xFFFFFFFF;
-  assertSame(0x100000000, f(a));
+function load(o, o2) {
+  return 1 + (o.x, o2.x_tagged);
 }
 
-TestNonSmiArrayLength();
+var deopt = false;
+var o2 = {x_tagged:{}};
+o2.x_tagged = 1;
 
+load({x:1}, o2);
+load({x:1}, o2);
+print(load(o, o2));
+%OptimizeFunctionOnNextCall(load);
+o2.x_tagged = true;
+print(load(o, o2));